Mimeo DH-68 Rev. 1963
REVIEW OF 1962-63 DHIA RECORDS S. M. Gregory, Extension Dairyman
DHIA records are one phase of the extension dairy program available in each Indiana county. DHIA records form the basis for two other dairy record keeping projects, namely the DHIR and the owner sampler record projects.
Data reported here is based on results reported for herds on test with DHIA records for 12 continuous months, starting May 1, 1962.
Information reported is the result of what actually developed in Indiana herds in the 12 months. The data are for analysis, comparison and establishment of bench marks in dairy feeding, management and breeding.

Information in Tables
Table 1: Levels of average butterfat production per cow on a herd basis are shown by years indicated. Unless a dairyman that has been cooperating with the DHIA program has made as much or more progress than the changes reported here, there is need for changes in his dairy management.
Table 2: Average yearly milk production per cow and the number of cow years of Production reported annually by DHIA records are shown. Average milk production per cow on test increased 40. 8 percent between 1932-33 through the 1962-63 testing year.
There were 4.387 times as many cows on test in 1962-63 as in 1932-33. Many factors have combined to make these changes pos-
sible. Records today are considered to be one of the valuable and necessary tools in the complex business of dairying.
Table 3: Herds grouped by average butterfat production per cow. Illustrated here is the importance of maintaining a high ratio of milk production per cwt. of body, through maintenance of a 10 month lactation period per cow in the herd, plus feed supplies in volume to meet high production required for an economical operation.
Table 4: Results obtained by cooperators when herds are grouped by the number of cows per herd.
Table 5: Herds grouped by average days in milk per cow in the herd for the year, with data relating to feed costs and income above feed costs.
Table 6. Levels of grain feeding followed by cooperators with relation to milk production, and feed cost per cwt. of milk.
Table 7: Production, feed costs and income above feed costs are reported by breed classification of herds. Without designation of registered or grade animals.
Table 8: Average body weight of herds; with production, feed costs and income above feed costs on the basis of a cwt. of body.
Table 9: Breed classification of herds; levels of milk production and average income above feed costs per cow.
Dairy Section • Animal Sciences Department
Cooperative Extension Service, PURDUE UNIVERSITY, Lafayette, Indiana